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/*
* Copyright 2018 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "include/core/SkCanvas.h"
#include "include/core/SkFont.h"
#include "include/core/SkPath.h"
#include "include/core/SkRRect.h"
#include "include/core/SkTypeface.h"
#include "src/base/SkRandom.h"
#include "tools/ToolUtils.h"
#include "tools/fonts/FontToolUtils.h"
#include "tools/timer/TimeUtils.h"
#include "tools/viewer/Slide.h"
#include <cmath>
// Implementation in C++ of Animated Emoji
// See https://t.d3fc.io/status/705212795936247808
// See https://crbug.com/848616
class GlyphTransformView : public Slide {
public:
GlyphTransformView() { fName = "Glyph Transform"; }
void load(SkScalar w, SkScalar h) override {
fEmojiFont = ToolUtils::EmojiSample();
fSize = {w, h};
}
void resize(SkScalar w, SkScalar h) override { fSize = {w, h}; }
void draw(SkCanvas* canvas) override {
SkPaint paint;
SkFont font(fEmojiFont.typeface);
const char* text = fEmojiFont.sampleText;
double baseline = fSize.height() / 2;
canvas->drawLine(0, baseline, fSize.width(), baseline, paint);
SkMatrix ctm;
ctm.setRotate(fRotate); // d3 rotate takes degrees
ctm.postScale(fScale * 4, fScale * 4);
ctm.postTranslate(fTranslate.fX + fSize.width() * 0.8, fTranslate.fY + baseline);
canvas->concat(ctm);
// d3 by default anchors text around the middle
SkRect bounds;
font.measureText(text, strlen(text), SkTextEncoding::kUTF8, &bounds);
canvas->drawSimpleText(text, strlen(text), SkTextEncoding::kUTF8, -bounds.centerX(), -bounds.centerY(),
font, paint);
}
bool animate(double nanos) override {
constexpr SkScalar maxt = 100000;
double t = TimeUtils::PingPong(1e-9 * nanos, 20, 0, 0, maxt); // d3 t is in milliseconds
fTranslate.set(sin(t / 3000) - t * fSize.width() * 0.7 / maxt, sin(t / 999) / t);
fScale = 4.5 - std::sqrt(t) / 99;
fRotate = sin(t / 734);
return true;
}
private:
ToolUtils::EmojiTestSample fEmojiFont;
SkVector fTranslate;
SkScalar fScale;
SkScalar fRotate;
SkSize fSize;
};
//////////////////////////////////////////////////////////////////////////////
DEF_SLIDE( return new GlyphTransformView(); )